/Engine/Plugins/Runtime/AR/AzureSpatialAnchors/Source/AzureSpatialAnchors/Public/AzureCloudSpatialAnchor.h
Set the Expiration time of the cloud anchor as seconds into the future. You must call SaveCloudAnchor or UpdateCloudAnchorProperties before this will be persisted on azure.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="AzureSpatialAnchors", Meta=(Keywords="azure spatial anchor hololens wmr pin ar all")) void SetExpiration ( const float Lifetime )